/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraNodeCustomHlsl.h
Replace items in the tokens array if they start with the src string or optionally src string and a namespace delimiter.
static uint32 ReplaceExactMatchTokens ( [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & Tokens, FStringView SrcString, FStringView ReplaceString, bool bAllowNamespaceSeparation )